uuid.js,uuid释义(http://zh.wikipedia.org/wiki/UUID),代码引自ActionScript UIDUtil类

uuid.js

(function(opt_ns,opt_win){

    var ALPHA_CHAR_CODES = [48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70];

    // var uuidBuffer = [];

    var uuidFactory = {
      
        /**
         * @return {String} 新生成的uuid字符串
         */
        createUUID:function(){
        
            var uid= new Array(36);

            var index = 0;
            
            var i , j;
            
            for (i = 0; i < 8; i++) {
                uid[index++] = ALPHA_CHAR_CODES[Math.floor(Math.random() *  16)];
            }

            for (i = 0; i < 3; i++) {
                uid[index++] = 45; // charCode for "-"
                
                for (j = 0; j < 4; j++) {
                    uid[index++] = ALPHA_CHAR_CODES[Math.floor(Math.random() *  16)];
                }
            }
            
            uid[index++] = 45; // charCode for "-"

            var time = new Date().getTime();

            var timeString = ("0000000" + time.toString(16).toUpperCase()).substr(-8);
            
            for (i = 0; i < 8; i++) {
                uid[index++] = timeString.charCodeAt(i);
            }
            
            for (i = 0; i < 4; i++) {
                uid[index++] = ALPHA_CHAR_CODES[Math.floor(Math.random() *  16)];
            }
            
            var uuid = String.fromCharCode.apply(null, uid);

            // uuidBuffer.push(uuid);

            return uuid;
        }
        // isUUIDExisted:function(uuid){
        //     var length = uuidBuffer.length ;
        //     for(var i = 0 ; i < length ; i++){
        //         if (uuid === uuidBuffer[i] ) {
        //             return true ;
        //         }
        //     }
        //     return false ;
        // }
  }
  opt_win = opt_win || top ;
  opt_ns = opt_ns || opt_win;
  opt_ns.uuidFactory = uuidFactory ;
  /**
   * 一种简化处理 http://note19.com/2007/05/27/javascript-guid-generator/
  function S4() {
     return (((1+Math.random())*0x10000)|0).toString(16).substring(1);
  }
  function guid() {
    return (S4()+S4()+"-"+S4()+"-"+S4()+"-"+S4()+"-"+S4()+S4()+S4());
  }
  **/

})()